<template>
	<div>
		<h1>当前求和为：{{ sum }}</h1>
		<h3>当前求和放大10倍为:{{bigSum}}</h3>
		<h3>我在{{  school }},学习：{{  subject }}</h3>
		<select v-model.number="n">
			<option value="1">1</option>
			<option value="2">2</option>
			<option value="3">3</option>
		</select>
		<button @click="increment">+</button>
		<button @click="decrement">-</button>
		<button @click="incrementOdd">当前求和为奇数再加</button>
		<button @click="incrementWait">等一等再加</button>
	</div>
</template>

<script>
	import {mapState, mapGetters} from 'vuex'
	export default {
		name:'Count',
		data() {
			return {
				n:1, //用户选择的数字
				
			}
		},
		computed:{
			//程序员亲自书写的代码
			// sum(){
			// 	return this.$store.state.sum
			// }

			//1.借助mapState生成=>对象写法
			//mapState里面需要几组数据，方法名和去state里面找的data
			//...能够使mapState结果（返回值为数组）里的每一项展开放在computed数组里面
			//...mapState({sum:'sum',school:'school',subject:'subject'})

			//2.函数名与data值一样，可以用数组写法简写
			...mapState(['sum','school','subject']),

			...mapGetters(['bigSum'])
		},
		methods: {
			//commit可以直接跟mutation对话
			increment(){
				this.$store.commit('JIA',this.n)
			},
			decrement(){
				this.$store.commit('JIAN',this.n)
			},
			incrementOdd(){
				this.$store.dispatch('jiaOdd',this.n)
			},
			incrementWait(){
				this.$store.dispatch('jiaWait',this.n)
			},
		},
	}
</script>

<style lang="css">
	button{
		margin-left: 5px;
	}
</style>
